Risk of respiratory diseases among hospitalized patients with hidradenitis suppurativa

Background Hidradenitis suppurativa (HS) is a systemic disorder associated with various metabolic and inflammatory comorbidities. Although HS shares risk factors and pathogenic pathways with various respiratory conditions, few studies have explored the relationship between HS and respiratory disease. Methods This is a cross‐sectional, case‐control, population‐based study that examined the United States National Inpatient Sample database from January 1, 2002, to December 31, 2012. HS was identified using ICD‐9‐CM codes during hospital admissions. Multivariable logistic regression was used to evaluate for adjusted associations between HS and respiratory diagnoses as compared to matched controls. Results Twenty‐three thousand seven hundred and sixty‐seven hospital admissions for HS were compared with 95,068 age‐ and sex‐matched controls. HS patients had significantly higher adjusted odds of asthma (OR: 1.233; 95% CI: [1.170–1.299]; P < 0.001), chronic airway obstruction (OR: 1.532; 95% CI: [1.419–1.651]; P < 0.001), sarcoidosis (OR: 1.601; 95% CI: [1.157–2.214]; P < 0.001), and sleep apnea (OR: 1.274; 95% CI: [1.182–1.374]; P < 0.001). Conclusion HS is associated with several common forms of respiratory disease. Knowledge of these associations may allow for better recognition of respiratory disease in HS patients.